EP0908165A2 - Verstellbare Vorderrad Stabilisator für angetriebene Rollstuhl - Google Patents

Verstellbare Vorderrad Stabilisator für angetriebene Rollstuhl Download PDF

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Publication number
EP0908165A2
EP0908165A2 EP98308016A EP98308016A EP0908165A2 EP 0908165 A2 EP0908165 A2 EP 0908165A2 EP 98308016 A EP98308016 A EP 98308016A EP 98308016 A EP98308016 A EP 98308016A EP 0908165 A2 EP0908165 A2 EP 0908165A2
Authority
EP
European Patent Office
Prior art keywords
arm
frame
stabilizer
wheel
power wheelchair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98308016A
Other languages
English (en)
French (fr)
Other versions
EP0908165A3 (de
Inventor
Dale A. Pulver
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Invacare Corp
Original Assignee
Invacare Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Invacare Corp filed Critical Invacare Corp
Publication of EP0908165A2 publication Critical patent/EP0908165A2/de
Publication of EP0908165A3 publication Critical patent/EP0908165A3/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/04—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven
    • A61G5/041—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven having a specific drive-type
    • A61G5/042—Front wheel drive
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1078—Parts, details or accessories with shock absorbers or other suspension arrangements between wheels and frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/14—Resilient suspensions characterised by arrangement, location or kind of springs having helical, spiral or coil springs only
    • B60G11/16—Resilient suspensions characterised by arrangement, location or kind of springs having helical, spiral or coil springs only characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
    • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G3/00—Resilient suspensions for a single wheel
    • B60G3/02—Resilient suspensions for a single wheel with a single pivoted arm
    • B60G3/12—Resilient suspensions for a single wheel with a single pivoted arm the arm being essentially parallel to the longitudinal axis of the vehicle
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/06—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/10—Independent suspensions
    • B60G2200/13—Independent suspensions with longitudinal arms only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/12—Wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/312—The spring being a wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/124—Mounting of coil springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/128—Damper mount on vehicle body or chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/129—Damper mount on wheel suspension or knuckle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/60—Subframe construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/24—Wheelchairs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S180/00—Motor vehicles
    • Y10S180/907—Motorized wheelchairs

Definitions

  • the invention relates to wheelchairs, and more particularly to power wheelchairs, in which a front wheel or mid-wheel drive assembly is used.
  • various aspects of the present invention may be used in related environments and applications.
  • Our U.S.A. Patent No. 5,575,348 is directed to a power wheelchair that is a rear wheel drive arrangement. That is, relatively large drive wheels are disposed toward a rear portion of the frame and smaller diameter driven wheels are caster mounted on a front end of the frame. Thus, even though the axis of the rear drive wheels is disposed beneath the seat, the drive wheels are more closely disposed adjacent a rear portion of the seat or rear portion of the frame.
  • An alternative arrangement mounts the drive wheels at a more central location beneath the seat or closer to the front of the frame.
  • These mounting arrangements provide what is commonly referred to as a mid-wheel drive or a front wheel drive power wheelchair arrangement.
  • the mid-wheel drive and front wheel drive styles will both be referred to as front wheel drive arrangements, although it is understood that particular details of the present invention apply to both.
  • the front wheel drive wheelchair typically includes a stabilizer that extends forwardly from the frame so that the wheelchair does not tip too far forwardly during operation. It is known to employ a wheel at the end of the stabilizer that is suspended for selective engagement with the ground surface. It is known that the wheel does not engage the ground surface during normal operation of the wheelchair.
  • Power wheelchairs are manufactured for use by different weight passengers. It can be desirable to alter the height of the stabilizer wheel from the ground surface to match a particular wheelchair user, a feature heretofore not adequately addressed by prior art wheelchairs. Adjusting the height of the front stabilizer allows the wheelchair to clear small height obstacles and yet be effective as an anti-tip assembly in the forward direction. Known arrangements do not provide an effective solution to this problem.
  • known front stabilizers do not permit variation in the preload force. That is, the front stabilizer will counteract tipping at a predetermined force. It is desirable to adjust the preload force so that the sensitivity of the front stabilizer can be altered.
  • prior arrangements of front stabilizers for front wheel drive wheelchairs have been ineffective in that regard. For example, even though known front stabilizers vary the preload force, they necessarily result in a change in the height of the stabilizer wheel also.
  • a power wheelchair comprising:
  • Such a power wheelchair can overcome the above mentioned problems and provide a simple, economical structure that is easily adjusted.
  • the wheelchair frame includes a longitudinal frame portion that extends fore and aft, and a lateral frame member that extends generally perpendicular thereto.
  • Drive wheels are rotatably mounted to the frame beneath a seat and at least one stabilizer wheel extends from the front end of the frame.
  • the front stabilizer can be adjustable in height relative to the frame to accommodate different users.
  • the wheelchair can include a pair of front stabilizers disposed one on each side of the wheelchair.
  • Each stabilizer includes the first arm that extends between the frame and the stabilizer wheel, and the second arm extending between the stabilizer wheel axis and a pivot on the frame spaced from the first arm attachment point.
  • Figures 1A and 1B show perspective views of respective front wheel drive wheelchair embodiments incorporating an adjustable front wheel stabilizer.
  • Figure 2 is an elevational view of the front wheel drive power wheelchair of Figure 1A incorporating a front wheel stabilizer.
  • Figure 3 is an enlarged view of the front suspension and front stabilizer assemblies of the Figure 1A embodiment.
  • Figure 4A is an exploded perspective view of the shock and stabilizer mountings of the Figure 1A embodiment and Figure 4B is a partially exploded view of the front stabilizer used in the embodiment of Figure 1B.
  • Figure 5A is an exploded perspective view of a preferred form of front stabilizer used in the embodiment of Figure 1A and Figure 5B is an exploded view of the adjustable cylinder of Figure 1B.
  • FIG. 1A and 1B show a power wheelchair A, again, either a mid-wheel drive arrangement ( Figures 1A and 1B) or a front wheel drive arrangement (not shown).
  • Figures 1A and 1B show a power wheelchair A, again, either a mid-wheel drive arrangement ( Figures 1A and 1B) or a front wheel drive arrangement (not shown).
  • the drawings occasionally identify selected components with a suffix "a” or "b" which is intended to represent that the wheelchair includes a pair of the described component (e.g. lefthand and right-hand components), it being understood that the description of one is applicable to the other unless noted to the contrary.
  • like elements in the different embodiments will be described with like numerals for consistency.
  • the wheelchair A includes a rigid frame 10 which in a preferred arrangement has first and second longitudinal frame members 12a, 12b that are interconnected by a cross frame member 14, which may be a single cross frame member or one of a pair of cross frame members.
  • a cross frame member 14 which may be a single cross frame member or one of a pair of cross frame members.
  • Each of the frame members is preferably of tubular construction that adds rigidity and strength to the frame assembly.
  • a seat 16 is shown mounted to the longitudinal frame members. It will be understood that a variety of conventional seats can be alternatively secured to the frame as desired.
  • a front rigging or footrest assembly 18 shown extending from a front edge of the seat support assembly is a front rigging or footrest assembly 18. Again, the footrest is of conventional structure so that further discussion herein is deemed unnecessary to a full and complete understanding of the present invention.
  • Each drive wheel 30 is rotatably mounted to a suspension arm assembly 32 that is pivotally mounted at one end 34 (Figure 4A) to an intermediate portion of the frame.
  • Figure 4A drive motors are also secured to the frame for operative connection with the respective drive wheels 30.
  • the embodiment of Figure 4A includes a suspension assembly while the Figure 4B embodiment does not.
  • a generally U-shaped plate 36 is secured to the suspension arm while in Figure 4B, the plate 36 is secured to the frame. In either event, the plate is either connected directly or indirectly to the frame.
  • a shock assembly or dampener 38 Enclosed within the plate 36 of Figure 4A is a shock assembly or dampener 38, a first or upper end 40 of which is secured to the front end of the frame while a second or lower end 42 is secured to a lower region of the plate.
  • the suspension assembly is intended to dampen or attenuate shocks and vibrations from the drive wheels that would otherwise be transferred to the remainder of the wheelchair frame.
  • the dampener counteracts the shock forces in a manner well known in the art.
  • Figure 1B does not include a suspension assembly, there is no shock absorber and the plate is connected directly to the frame.
  • a front stabilizer assembly 50 is also mounted to the front end of the frame. It includes a first arm 52 that is pivotally mounted at an upper end 54 to a front edge of the longitudinal frame. For example, a U-shaped gusset 56 secured to the frame can receive a bolt 58 that acts as a pin mounting for pivotally receiving the upper end of the first arm in the embodiment of Figure 1A.
  • a second or lower end of the first arm receives a stabilizer wheel 62. The wheel selectively rotates about an axis 64, which axis may vary in height relative to the ground surface.
  • the first arm preferably includes a dampening member defined by cylinder 66 surrounded by spring 68.
  • the cylinder includes a housing from which an elongate reciprocating member 70 extends and over which the spring is received.
  • the reciprocating member is threaded at its upper end.
  • the reciprocating member 70 receives an annular plate 72 that abuts against an upper end of the spring, an adjustment nut 74, a jam nut 76, and stabilizer cylinder barrel 78.
  • the barrel 78 is connected to the frame by means of the threaded fastener 58.
  • a second arm 60 defines a link that interconnects the front stabilizer to the suspension assembly in the embodiment of Figure 1A. More particularly, a first end 82 of the second arm is connected to the rotational axis of the stabilizer wheel, while a second end 84 is secured to the lower end of the shock absorber at its connection with plate 36. Thus, upward movement of the stabilizer wheel is generally pivoted about the fastener extending through the lower end of the shock assembly 42.
  • the extent of movement of the front stabilizer wheel is represented in solid and phantom lines in Figures 2 and 3, the downwardly biased position being normally spaced from the ground surface and the stabilizer wheel engaging the ground in the compressed position.
  • the first arm is directly connected to the frame via a pivot connection at its first or upper end, while the second or lower end of the first arm is connected to the second arm at a region intermediate the first and second ends thereof.
  • the front stabilizer of Figure 1B is structurally and functionally similar to that of Figure 1A.
  • the downward position shown in solid line is spaced from the ground surface. This spacing allows the wheelchair to clear low-height obstacles without the front stabilizer dragging on the ground.
  • rotating the adjustment nut 74 allows the preload of the spring 68 to be adjusted. That is, rotating the adjustment nut 74 in one direction or the other either advances the nut and the annular plate 72 downwardly or upwardly along the threaded portion 70 of the cylinder. Since the lower end of spring 68 is fixed against movement by abutting the fork assembly mounted to the stabilizer wheel, adjustment of the upper end of the spring, i.e., via the annular plate 72, allows the preload force of the spring to be altered. Once the desired location is obtained, the length of the spring is set, thus providing a desired preload force. This allows adjustment of the stabilizer preload force independent of the height adjustment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Vehicle Body Suspensions (AREA)
EP98308016A 1997-10-06 1998-10-01 Verstellbare Vorderrad Stabilisator für angetriebene Rollstuhl Withdrawn EP0908165A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US944194 1997-10-06
US08/944,194 US5848658A (en) 1997-10-06 1997-10-06 Adjustable front wheel stabilizer for power wheelchair

Publications (2)

Publication Number Publication Date
EP0908165A2 true EP0908165A2 (de) 1999-04-14
EP0908165A3 EP0908165A3 (de) 1999-12-08

Family

ID=25480979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98308016A Withdrawn EP0908165A3 (de) 1997-10-06 1998-10-01 Verstellbare Vorderrad Stabilisator für angetriebene Rollstuhl

Country Status (3)

Country Link
US (1) US5848658A (de)
EP (1) EP0908165A3 (de)
CA (1) CA2239690C (de)

Cited By (13)

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US6070898A (en) * 1998-08-14 2000-06-06 Sunrise Medical, Inc. Suspension system for a wheelchair
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US6923280B2 (en) 2000-10-27 2005-08-02 Invacare Corporation Obstacle traversing wheelchair
US7066290B2 (en) 2001-10-19 2006-06-27 Invacare Corp. Wheelchair suspension having pivotal motor mount
US9603762B2 (en) 2007-02-08 2017-03-28 Invacare Corporation Wheelchair suspension
US9700470B2 (en) 2012-02-15 2017-07-11 Invacare Corporation Wheelchair suspension
US9827823B2 (en) 2007-02-14 2017-11-28 Invacare Corporation Stability control system
CN107518990A (zh) * 2016-06-22 2017-12-29 富宥科技股份有限公司 电动轮椅的车架
US9925100B2 (en) 2002-10-25 2018-03-27 Invacare Corporation Suspension for wheeled vehicles
US11096845B2 (en) 2009-10-09 2021-08-24 Invacare Corporation Wheelchair suspension
US11213441B2 (en) 2002-10-25 2022-01-04 Invacare Corporation Suspension for wheeled vehicles
US11903887B2 (en) 2020-02-25 2024-02-20 Invacare Corporation Wheelchair and suspension systems

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US6279927B1 (en) * 1997-06-06 2001-08-28 Misawahomu Kabushiki Kaisha Wheelchair
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US6601863B1 (en) * 1997-10-06 2003-08-05 Invacare Corporation Mid-wheel drive wheelchair with rigid front wheel anti-tip stabilizer
US6179076B1 (en) * 1998-10-06 2001-01-30 Sunnybrook & Women's College Health Sciences Centre Motorized chair base
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US20070063502A1 (en) * 2005-08-29 2007-03-22 Greig Mark E Steering ratio mechanism for a maneuverable motorized personally operated vehicle
US7293620B2 (en) * 2005-11-22 2007-11-13 Chao Ya-Chen Front wheel stabilizing device for an electric motor-driven wheeled vehicle
CN2882586Y (zh) * 2006-03-08 2007-03-28 唐承慧 一种新型中驱电动轮椅车的前后臂连接机构
EP1943995A1 (de) 2007-01-12 2008-07-16 Invacare International Sàrl Fahrbare Transporteinrichtung mit Aufhängungsarmen für Räder
DE102007016662C5 (de) * 2007-04-04 2022-09-15 Kuka Deutschland Gmbh Omnidirektionales Fahrzeug und mobiler Industrieroboter
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US8851214B2 (en) 2010-07-15 2014-10-07 Permobil Ab Electric mid-wheel drive wheelchair
JP2012223527A (ja) * 2011-04-22 2012-11-15 Yasunobu Handa 三輪型足漕ぎ式車椅子
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CA2239690C (en) 2004-07-27
US5848658A (en) 1998-12-15
EP0908165A3 (de) 1999-12-08

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